Compact LTCC millimeter wave radiating filter dedicated to antenna array

An original new design of microwave LTCC (Low Temperature Co-fired Ceramic) structure integrating a resonator and a patch antenna on a single device is presented. The structure is composed of a U-shape resonator that is magnetically coupled to the patch antenna. In order to validate the radiating structure concept, a two pole filter is designed using both the resonator resonance and the patch antenna one. Experimental results presented in this paper validate this very compact structure. Then, a new design has been studied composed of two elementary radiant filters in order to realize linear array of patch antennas. The first results (return loss and radiation pattern) are very encouraging.